1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 Revision 1.24 2000/08/28 10:02:30 kowal2
19 Corrected bug in the StepManager
21 Revision 1.23 2000/07/10 20:57:39 hristov
22 Update of TPC code and macros by M.Kowalski
24 Revision 1.22 2000/06/30 12:07:50 kowal2
25 Updated from the TPC-PreRelease branch
27 Revision 1.21.2.4 2000/06/26 07:39:42 kowal2
28 Changes to obey the coding rules
30 Revision 1.21.2.3 2000/06/25 08:38:41 kowal2
31 Splitted from AliTPCtracking
33 Revision 1.21.2.2 2000/06/16 12:58:13 kowal2
34 Changed parameter settings
36 Revision 1.21.2.1 2000/06/09 07:15:07 kowal2
38 Defaults loaded automatically (hard-wired)
39 Optional parameters can be set via macro called in the constructor
41 Revision 1.21 2000/05/15 10:00:30 kowal2
42 Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova
44 Revision 1.20 2000/04/17 09:37:33 kowal2
45 removed obsolete AliTPCDigitsDisplay.C
47 Revision 1.19.8.2 2000/04/10 08:31:52 kowal2
49 Different geometry for different sectors
50 Updated readout chambers
51 Some modifications to StepManager by J.Belikov
53 Revision 1.19.8.1 2000/04/10 07:56:53 kowal2
54 Not used anymore - removed
56 Revision 1.19 1999/11/04 17:28:07 fca
57 Correct barrel part of HV Degrader
59 Revision 1.18 1999/10/14 16:52:08 fca
60 Only use PDG codes and not GEANT ones
62 Revision 1.17 1999/10/08 06:27:23 fca
63 Corrected bug in the HV degrader geometry, thanks to G.Tabary
65 Revision 1.16 1999/10/04 13:39:54 fca
66 Correct array index problem
68 Revision 1.15 1999/09/29 09:24:34 fca
69 Introduction of the Copyright and cvs Log
74 ///////////////////////////////////////////////////////////////////////////////
76 // Time Projection Chamber version 2 -- detailed TPC and slow simulation //
80 <img src="picts/AliTPCv2Class.gif">
85 ///////////////////////////////////////////////////////////////////////////////
91 #include "AliTPCDigitsArray.h"
96 #include "AliTPCParam.h"
97 #include "AliTPCParamSR.h"
101 //_____________________________________________________________________________
102 AliTPCv2::AliTPCv2(const char *name, const char *title) :
106 // Standard constructor for Time Projection Chamber version 2
112 SetBufferSize(128000);
114 SetGasMixt(2,20,10,-1,0.9,0.1,0.); // Ne-CO2 90-10
120 SetSecLows(1, 2, 3, 19, 20, 21);
121 SetSecUps(37, 38, 39, 37+18, 38+18, 39+18, -1, -1, -1, -1, -1, -1);
122 SetSens(1); // sensitive strips set
125 fTPCParam->Write(fTPCParam->GetTitle());
128 //_____________________________________________________________________________
129 void AliTPCv2::CreateGeometry()
132 // Create the geometry of Time Projection Chamber version 2
136 <img src="picts/AliTPC.gif">
141 <img src="picts/AliTPCv2Tree.gif">
146 Int_t *idtmed = fIdtmed->GetArray();
157 Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
158 Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
160 // ---------------------------------------------------
161 // sector specification check
162 // ---------------------------------------------------
166 for (i = 0; i < 6; ++i) {
167 if (fSecLows[i] >= 0 && fSecLows[i] < 2*nInnerSector) {
169 printf("*** SECTOR %d selected\n",fSecLows[i]);
174 printf("*** ALL LOWER SECTORS SELECTED ***\n");
181 for (i = 0; i < 12; ++i) {
182 if (fSecUps[i] > 2*nInnerSector-1 &&
183 fSecUps[i] < 2*(nInnerSector+nOuterSector)) {
185 printf("*** SECTOR %d selected\n",fSecUps[i]);
190 printf("*** ALL UPPER SECTORS SELECTED ***\n");
194 if (ifl1 == 0 && ifl2 == 0) {
195 printf("*** ERROR: AT LEAST ONE SECTOR MUST BE SPECIFIED ***\n");
196 printf("!!! PROGRAM STOPPED !!!\n");
200 if ((fSecAL < 0 || fSecAU < 0) && fSens >= 0) {
201 printf("** ERROR: STRIPS CANNOT BE SPECIFIED FOR ALL SECTORS **\n");
202 printf("!!! PROGRAM STOPPED !!!\n");
206 //--------------------------------------------------------------------
209 // Mother volume (Air) - all volumes will be positioned in it
289 gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,39);
292 //-------------------------------------------------------------------
293 // Tpc Outer INsulator (CO2)
294 //-------------------------------------------------------------------
333 gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
335 //---------------------------------------------------------------
336 // shreds (G10) - TPC Rings
337 //---------------------------------------------------------------
339 gMC->Gsvolu("TPCR","TUBE",idtmed[12],dm,0);
345 gMC->Gsposp("TPCR",1,"TOIN",0.,0.,-253.3,0,"ONLY",dm,3); // left bottom
353 gMC->Gsposp("TPCR",2,"TOIN",0.,0.,253.3,0,"ONLY",dm,3); // right
361 gMC->Gsposp("TPCR",3,"TOIN",0.,0.,-250.7,0,"ONLY",dm,3); // left top
363 //----------------------------------------------------------------
364 // Tpc Outer Contaiment Vessel
365 // mother volume - Al, daughters - composite (sandwich)
366 //----------------------------------------------------------------
402 gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,18);
406 // Tpc SAndwich 1 - Al
412 gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
414 // Tpc SAndwich 2 - Tedlar
419 gMC->Gsvolu("TSA2","TUBE",idtmed[9],dm,3);
421 // Tpc SAndwich 3 - Kevlar
426 gMC->Gsvolu("TSA3","TUBE",idtmed[5],dm,3);
428 // Tpc SAndwich 4 - NOMEX honeycomb
433 gMC->Gsvolu("TSA4","TUBE",idtmed[5],dm,3);
437 gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
438 gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
439 gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
441 gMC->Gspos("TSA1",1,"TOCV",0.,0.,2.6,0,"ONLY");
445 gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
447 //-------------------------------------------------------
448 // Tpc Outer Field Cage
449 // mother volume - Al, daughters - composite (sandwich)
450 //-------------------------------------------------------
490 gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);
494 // Tpc SAndwich 5 - Al
500 gMC->Gsvolu("TSA5","TUBE",idtmed[4],dm,3);
502 // Tpc SAndwich 6 - Tedlar
507 gMC->Gsvolu("TSA6","TUBE",idtmed[9],dm,3);
509 // Tpc SAndwich 7 - Kevlar
514 gMC->Gsvolu("TSA7","TUBE",idtmed[5],dm,3);
516 // Tpc SAndwich 8 - NOMEX
521 gMC->Gsvolu("TSA8","TUBE",idtmed[6],dm,3);
525 gMC->Gspos("TSA8",1,"TSA7",0.,0.,0.,0,"ONLY");
526 gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
527 gMC->Gspos("TSA6",1,"TSA5",0.,0.,0.,0,"ONLY");
529 gMC->Gspos("TSA5",1,"TOFC",0.,0.,0.,0,"ONLY");
533 gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY");
537 gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
539 //--------------------------------------------------------------------
540 // Tpc Inner INsulator (CO2)
541 //--------------------------------------------------------------------
556 Float_t tanL = (66.2-59.0)/(255.6-73.3); // tangent of the left cone part
559 dm[7]= 59.0+ (253.6-73.3)*tanL;
640 gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,48);
643 //--------------------------------------------------------------------
644 // Tpc Inner Containment vessel, Left part
645 // mother volume - Al, daughter - composite (sandwich)
646 //--------------------------------------------------------------------
660 Float_t cosL = 1./TMath::Sqrt(1.+tanL*tanL);
661 Float_t sandThick = 2.14; // cone composite thickness
667 dm[7]= 59.0 + (253.6-73.3)*tanL;
674 dm[11]= dm[7]+sandThick/cosL;
679 dm[13]= 59.0+(75.6-73.3)*tanL;
680 dm[14]= dm[13]+sandThick/cosL;
706 gMC->Gsvolu("TICL","PCON",idtmed[4],dm,27);
710 // Tpc SAndwich 9 - Al
719 dm[4]= 59.0+(254.3-73.3)*tanL;
720 dm[5]= dm[4]+sandThick/cosL;
725 dm[7]= 59.0+(78.3-73.3)*tanL;
726 dm[8]= dm[7]+sandThick/cosL;
730 gMC->Gsvolu("TSA9","PCON",idtmed[4],dm,9);
732 // Tpc SAndwich 10 - Tedlar
742 gMC->Gsvolu("TS10","PCON",idtmed[9],dm,9);
744 // Tpc SAndwich 11 - Kevlar
754 gMC->Gsvolu("TS11","PCON",idtmed[5],dm,9);
756 // Tpc SAndwich 12 - NOMEX
766 gMC->Gsvolu("TS12","PCON",idtmed[6],dm,9);
770 gMC->Gspos("TS12",1,"TS11",0.,0.,0.,0,"ONLY");
771 gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
772 gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
776 gMC->Gspos("TSA9",1,"TICL",0.,0.,0.,0,"ONLY");
778 //--------------------------------------------------------------------
779 // Tpc Inner Containment vessel, Right part
780 // mother volume - Al, daughter - composite (sandwich)
781 //--------------------------------------------------------------------
807 Float_t tanR = (66.0-59.0)/(250.5-73.3); // to avoid accuracy problems
808 Float_t cosR = 1./TMath::Sqrt(1.+tanR*tanR); //as above
813 dm[13]= 59.0+(75.6-73.3)*tanR;
820 dm[17]= dm[16]+sandThick/cosR;
825 dm[19]= 59.0+(248.4-73.3)*tanR;
826 dm[20]= dm[19]+sandThick/cosR;
840 gMC->Gsvolu("TICR","PCON",idtmed[4],dm,27);
846 // Tpc SAndwich 13 - Al
855 dm[4]= 59.0+(78.3-73.3)*tanR;
856 dm[5]= dm[4]+sandThick/cosR;
861 dm[7]= 59.0+(249.1-73.3)*tanR;
862 dm[8]= dm[7]+sandThick/cosR;
866 gMC->Gsvolu("TS13","PCON",idtmed[4],dm,9);
868 // Tpc SAndwich 14 - Tedlar
878 gMC->Gsvolu("TS14","PCON",idtmed[9],dm,9);
880 // Tpc SAndwich 15 - Kevlar
890 gMC->Gsvolu("TS15","PCON",idtmed[5],dm,9);
892 // Tpc SAndwich 16 - NOMEX
902 gMC->Gsvolu("TS16","PCON",idtmed[6],dm,9);
906 gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
907 gMC->Gspos("TS15",1,"TS14",0.,0.,0.,0,"ONLY");
908 gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
912 gMC->Gspos("TS13",1,"TICR",0.,0.,0.,0,"ONLY");
914 //------------------------------------------------------
915 // Tpc Inner Field Cage
916 // mother volume - Al, daughters - composite (sandwich)
917 //------------------------------------------------------
959 gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,21);
963 // Tpc Sandwich 17 - Al
969 gMC->Gsvolu("TS17","TUBE",idtmed[4],dm,3);
971 // Tpc Sandwich 18 - Tedlar
976 gMC->Gsvolu("TS18","TUBE",idtmed[9],dm,3);
978 // Tpc Sandwich 19 - Kevlar
983 gMC->Gsvolu("TS19","TUBE",idtmed[5],dm,3);
985 // Tpc Sandwich 20 - NOMEX
990 gMC->Gsvolu("TS20","TUBE",idtmed[6],dm,3);
994 gMC->Gspos("TS20",1,"TS19",0.,0.,0.,0,"ONLY");
995 gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
996 gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
1000 gMC->Gspos("TS17",1,"TIFC",0.,0.,0.,0,"ONLY");
1008 gMC->Gsposp("TPCR",4,"TIIN",0.,0.,-253.3,0,"ONLY",dm,3);
1013 gMC->Gsposp("TPCR",5,"TIIN",0.,0.,250.7,0,"ONLY",dm,3);
1018 gMC->Gsposp("TPCR",6,"TIIN",0.,0.,253.3,0,"ONLY",dm,3);
1022 gMC->Gspos("TICL",1,"TIIN",0.,0.,0.,0,"ONLY");
1026 gMC->Gspos("TICR",1,"TIIN",0.,0.,0.,0,"ONLY");
1030 gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
1032 // Tpc Sandwich 21 - Al (central barrel)
1038 gMC->Gsvolu("TS21","TUBE",idtmed[4],dm,3);
1040 // Tpc Sandwich 22 - Tedlar (central barrel)
1045 gMC->Gsvolu("TS22","TUBE",idtmed[9],dm,3);
1047 // Tpc Sandwich 23 - Kevlar (central barrel)
1052 gMC->Gsvolu("TS23","TUBE",idtmed[5],dm,3);
1054 // Tpc Sandwich 24 - NOMEX (central barrel)
1059 gMC->Gsvolu("TS24","TUBE",idtmed[6],dm,3);
1063 gMC->Gspos("TS24",1,"TS23",0.,0.,0.,0,"ONLY");
1064 gMC->Gspos("TS23",1,"TS22",0.,0.,0.,0,"ONLY");
1065 gMC->Gspos("TS22",1,"TS21",0.,0.,0.,0,"ONLY");
1067 gMC->Gspos("TS21",1,"TIIN",0.,0.,0.,0,"ONLY");
1069 // put everything into the TPC
1071 gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
1074 //---------------------------------------------------------
1075 // Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
1076 // and its daughters (HV membrane, rods, readout chambers)
1077 //---------------------------------------------------------
1083 gMC->Gsvolu("TDGN","TUBE",idtmed[1],dm,3); // nonsensitive
1085 // sector opening angles
1087 Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
1088 Float_t outerOpenAngle = fTPCParam->GetOuterAngle();
1090 // sector angle shift
1092 Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
1094 // All above parameters are identical for inner and outer
1095 // sectors. The distinction is kept for the historical reasons
1096 // and eventually will disappear.
1098 Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
1099 Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
1102 //-------------------------------------------------------------------------
1103 // Tpc Inner Readout Chambers
1104 //-------------------------------------------------------------------------
1108 dm[2]= 1.6; // thickness
1111 gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
1113 // this volume will be positioned in the empty space
1114 // of the end-cap to avoid overlaps
1121 gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
1123 //------------------------------------------------
1124 // Tpc Inner readout chamber Pad Plane
1125 //------------------------------------------------
1132 gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
1136 dm[0] -= 1.218511934;
1137 dm[1] -= 1.218511934;
1140 gMC->Gsvolu("TIC3","TRD1",idtmed[1],dm,4);
1142 gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
1144 gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
1146 //----------------------------------------------
1147 // Tpc Readout Chambers Empty spaces - for both
1148 // inner and outer sectors
1149 //----------------------------------------------
1151 gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
1153 // Inner sector - 4 spaces
1164 space = rr*tanAlpha-dm[0];
1166 for(Int_t nsLow=0;nsLow<4;nsLow++){
1169 dm[1]= rr*tanAlpha - space;
1173 gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
1179 gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
1182 dm[0] = rr*tanAlpha - space;
1188 // dm[1] - this is the dm[1] from the previous TRCE
1192 gMC->Gsposp("TRCE",9,"TIC1",0.,-1.2,0.,0,"ONLY",dm,4);
1195 // TPc Space for Connectors
1202 gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1210 gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3);
1212 gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1219 Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
1221 // inner part of the inner sector - 2 x 20 holes
1223 astep = 20.00096874/19.;
1225 alpha = 10.00048437-astep;
1237 for(ncon=0;ncon<20;ncon++){
1243 phi3 = (alpha>0) ? 0. : 180.;
1244 theta3 = TMath::Abs(alpha);
1246 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1250 gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1251 gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1262 // outer part of the inner sector - 2 x 25 holes
1264 astep = 20.00096874/24.;
1265 alpha = 10.00048437-astep;
1273 for(ncon=0;ncon<25;ncon++){
1279 phi3 = (alpha>0) ? 0. : 180.;
1280 theta3 = TMath::Abs(alpha);
1282 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1286 gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1287 gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1298 //--------------------------------------------------------------------------
1299 // TPC Outer Readout Chambers
1300 // this is NOT a final design
1301 //--------------------------------------------------------------------------
1305 dm[2]= 1.5; //thickness
1308 gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1310 //------------------------------------------------
1311 // Tpc Outer readout chamber Pad Plane
1312 //------------------------------------------------
1316 gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1318 dm[0] -= 1.218511934;
1319 dm[1] -= 1.218511934;
1322 gMC->Gsvolu("TOC3","TRD1",idtmed[1],dm,4);
1324 gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1326 gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1336 gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);
1343 gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1350 gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4);
1354 //-----------------------------------------------
1355 // Tpc Services Support Wheel
1356 //-----------------------------------------------
1371 gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1373 // Tpc Services Wheel Cover
1378 gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1380 // Tpc Service wheel Cover Empty space
1387 gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1389 // Tpc services Wheel Empty Spaces
1396 gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1398 // Tpc Services Wheel Bars
1400 gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1410 gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1415 gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1417 // TPc ELectronics - right now 30% X0 Si
1424 gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1425 gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1427 //--------------------------------------------------------------------------
1429 //--------------------------------------------------------------------------
1431 // TPc Main Wheel - Al
1437 gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1439 // TPc Extra Wheel (to avoid overlapping) - Al
1445 gMC->Gsvolu("TPEW","TUBE",idtmed[4],dm,3);
1447 //--------------------------------------------------------------------------
1448 // Tpc Empty Space for the Readout chambers
1449 //--------------------------------------------------------------------------
1453 Float_t dR = 0.5*(rUp-rLow);
1455 space= 1.4/cosAlpha; // wheel ribs are 2.8 cm wide
1457 dm[0]= rLow*tanAlpha-space;
1458 dm[1]= rUp*tanAlpha-space;
1462 gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1467 gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1472 gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1474 // Tpc Empty Space Bars - Al (daughters of TESR)
1478 gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1482 dm[0]= rLow*tanAlpha-space;
1483 dm[1]= 88.7*tanAlpha-space;
1489 gMC->Gsposp("TESB",1,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1493 dm[0]= 131.65*tanAlpha-space;
1494 dm[1]= 136.5*tanAlpha-space;
1497 zBar = -dR +131.65+dm[3]-rLow;
1499 gMC->Gsposp("TESB",2,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1503 dm[0]= 240.4*tanAlpha-space;
1504 dm[1]= rUp*tanAlpha-space;
1509 gMC->Gsposp("TESB",3,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1511 //------------------------------------------------------
1512 // TPc Lower "S" Sectors
1513 //------------------------------------------------------
1516 Float_t inSecLowEdge = fTPCParam->GetInnerRadiusLow();
1517 Float_t inSecUpEdge = fTPCParam->GetInnerRadiusUp();
1519 dm[0] = inSecLowEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1520 dm[1] = inSecUpEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1521 dm[2] = 0.5*(250. - 0.3);
1522 dm[3] = 0.5*(inSecUpEdge-inSecLowEdge);
1524 gMC->Gsvolu("TPLS", "TRD1", idtmed[2], dm, 4); // sensitive
1526 //----------------------------------------------------------
1527 // TPc Upper Sectors
1528 //----------------------------------------------------------
1530 Float_t ouSecLowEdge = fTPCParam->GetOuterRadiusLow();
1531 Float_t ouSecUpEdge = fTPCParam->GetOuterRadiusUp();
1533 dm[0] = ouSecLowEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1534 dm[1] = ouSecUpEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1535 dm[2] = 0.5*(250. - 0.3);
1536 dm[3] = 0.5*(ouSecUpEdge-ouSecLowEdge);
1538 gMC->Gsvolu("TPUS", "TRD1", idtmed[2], dm, 4); // sensitive
1541 // if sensitive strips selected
1545 gMC->Gsvolu("TPSS","TRD1",idtmed[2],dm,0); // sensitive
1547 Int_t nofStrips,nstr;
1549 Float_t stripThick = 0.01; // 100 microns
1554 nofStrips = fTPCParam->GetNRowLow();
1555 deadSpace = fTPCParam->GetInnerWireMount();
1557 dm[2] = 0.5*(250. - 0.3);
1558 dm[3] = 0.5 * stripThick;
1560 for(nstr=0;nstr<nofStrips;nstr++){
1562 r1 = fTPCParam->GetPadRowRadiiLow(nstr);
1563 r2 = r1 + stripThick;
1564 dm[0] = r1 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1565 dm[1] = r2 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1566 zs = -inSecLowEdge -0.5*(inSecUpEdge-inSecLowEdge);
1570 gMC->Gsposp("TPSS", nstr+1, "TPLS", 0., 0., zs, 0, "ONLY", dm, 4);
1572 gMC->Gsord("TPLS",3);
1576 Int_t nsSave = nofStrips;
1580 nofStrips = fTPCParam->GetNRowUp();
1581 deadSpace = fTPCParam->GetOuterWireMount();
1583 dm[2] = 0.5*(250. - 0.3);
1584 dm[3] = 0.5 * stripThick;
1586 for(nstr=0;nstr<nofStrips;nstr++){
1588 r1 = fTPCParam->GetPadRowRadiiUp(nstr);
1589 r2 = r1 + stripThick;
1590 dm[0] = r1 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1591 dm[1] = r2 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1592 zs = -ouSecLowEdge -0.5*(ouSecUpEdge-ouSecLowEdge);
1596 gMC->Gsposp("TPSS", nstr+1+nsSave, "TPUS", 0., 0., zs, 0, "ONLY", dm, 4);
1601 //-------------------------------------------------------
1602 // positioning of the empty spaces into the main wheel
1603 // and readout chambers and sectors into the drift gas
1604 //-------------------------------------------------------
1606 Float_t rCenter,xc,yc;
1607 Float_t rInner,rOuter; // center of the inner and outer chamber
1614 for(Int_t ns=0; ns<nInnerSector;ns++){
1616 phi1 = ns * innerOpenAngle + innerAngleShift;
1617 phi1 *= kRaddeg; // in degrees
1619 phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1621 if (phi1 > 360.) phi1 -= 360.;
1626 phi3 = ns * innerOpenAngle + innerAngleShift;
1627 phi3 *= kRaddeg; // in degrees
1629 phi3 = (Float_t)TMath::Nint(phi3);
1631 if(phi3 > 360.) phi3 -= 360.;
1635 // "holes"->End plate
1637 xc = rCenter*TMath::Cos(phi3*kDegrad);
1638 yc = rCenter*TMath::Sin(phi3*kDegrad);
1640 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1642 gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1644 // TSCE->TSWC (services wheel volumes)
1646 xc = 166.142*TMath::Cos(phi3*kDegrad);
1647 yc = 166.142*TMath::Sin(phi3*kDegrad);
1649 gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1650 gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1652 // readout chambers->TDGN (drift gas)
1654 xc = rInner*TMath::Cos(phi3*kDegrad);
1655 yc = rInner*TMath::Sin(phi3*kDegrad);
1657 gMC->Gspos("TIRC",ns+1,"TDGN",xc,yc,252.,idrotm[nRotMat],"ONLY");
1659 // here lower sectors
1663 // all lower sectors are positioned
1665 gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1667 Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1671 // only selected sectors are positioned (up to 6 sectors)
1673 for(Int_t sel=0;sel<6;sel++){
1675 if(fSecLows[sel] == ns){
1676 gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1678 else if(fSecLows[sel] == ns+nInnerSector){
1680 Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1683 } // lower sectors finished
1685 xc = rOuter*TMath::Cos(phi3*kDegrad);
1686 yc = rOuter*TMath::Sin(phi3*kDegrad);
1688 gMC->Gspos("TORC",ns+1,"TDGN",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1690 // here upper sectors
1694 // all upper sectors
1696 gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1698 Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1702 // only selected sectors (up to 12)
1704 for(Int_t sel=0;sel<12;sel++){
1705 if(fSecUps[sel] == ns+2*nInnerSector){
1706 gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1708 else if(fSecUps[sel] == ns+2*nInnerSector+nOuterSector){
1710 Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1713 } // upper sectors finished
1717 theta2 = 0.; // reflection, needed for readout chambers!
1719 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1721 xc = rInner*TMath::Cos(phi3*kDegrad);
1722 yc = rInner*TMath::Sin(phi3*kDegrad);
1724 gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGN",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1726 xc = rOuter*TMath::Cos(phi3*kDegrad);
1727 yc = rOuter*TMath::Sin(phi3*kDegrad);
1729 gMC->Gspos("TORC",ns+nOuterSector+1,"TDGN",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1736 // reflection matrix
1745 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1750 gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1751 gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[nRotMat],"ONLY");
1752 gMC->Gspos("TPEW",1,"TPC ",0.,0.,257.65,0,"ONLY");
1753 gMC->Gspos("TPEW",2,"TPC ",0.,0.,-257.65,0,"ONLY");
1757 //-------------------------------------------------------
1758 // Tpc High Voltage Membrane - NOMEX honeycomb
1759 //-------------------------------------------------------
1778 gMC->Gsvolu("THVM","PGON",idtmed[6],dm,10);
1780 gMC->Gspos("THVM",1,"TDGN",0.,0.,0.,0,"ONLY");
1782 //----------------------------------------------------------
1783 // TPc Support Rods - MAKROLON
1784 //----------------------------------------------------------
1790 gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,3);
1792 for(Int_t nrod=1;nrod<18;nrod++){
1793 Float_t angle=innerOpenAngle*(Float_t)nrod;
1795 xc=82.4*TMath::Cos(angle);
1796 yc=82.4*TMath::Sin(angle);
1798 gMC->Gspos("TPSR",nrod,"TDGN",xc,yc,126.95,0,"ONLY");
1799 gMC->Gspos("TPSR",nrod+17,"TDGN",xc,yc,-126.95,0,"ONLY");
1801 xc=254.2*TMath::Cos(angle);
1802 yc=254.2*TMath::Sin(angle);
1804 gMC->Gspos("TPSR",nrod+34,"TDGN",xc,yc,126.95,0,"ONLY");
1805 gMC->Gspos("TPSR",nrod+51,"TDGN",xc,yc,-126.95,0,"ONLY");
1809 //----------------------------------------------------------
1810 // Tpc High Voltage rod - MAKROLON + Copper cable
1811 //----------------------------------------------------------
1813 // rod with cable (Left)
1819 gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1827 gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1835 gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1837 gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1838 gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1840 // rod without cable
1846 gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1850 gMC->Gspos("THVL",1,"TDGN",82.4,0.,-126.95,0,"ONLY");
1851 gMC->Gspos("THVL",2,"TDGN",254.2,0.,-126.95,0,"ONLY");
1853 gMC->Gspos("THVR",1,"TDGN",82.4,0.,126.95,0,"ONLY");
1854 gMC->Gspos("THVR",2,"TDGN",254.2,0.,126.95,0,"ONLY");
1858 gMC->Gspos("TDGN",1,"TPC ",0.,0.,0.,0,"ONLY");
1860 // services wheel cover -> wheel
1863 gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1864 gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1867 // put the wheel into the TPC
1869 gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1870 gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1872 gMC->Gsord("TPMW",6);
1873 gMC->Gsord("TPLS",3);
1874 gMC->Gsord("TPUS",3);
1875 gMC->Gsord("TDGN",6);
1876 gMC->Gsord("TSSW",6);
1877 gMC->Gsord("TSWC",6);
1879 // put the TPC into ALIC (main mother volume)
1881 gMC->Gspos("TPC ", 1, "ALIC", 0, 0, 0, 0, "ONLY");
1883 } // end of function
1885 //_____________________________________________________________________________
1886 void AliTPCv2::DrawDetector()
1889 // Draw a shaded view of the Time Projection Chamber version 1
1892 // Set everything unseen
1893 gMC->Gsatt("*", "seen", -1);
1895 // Set ALIC mother transparent
1896 gMC->Gsatt("ALIC","SEEN",0);
1898 // Set the volumes visible
1901 gMC->Gsatt("TPC ","SEEN",0);
1902 gMC->Gsatt("TOIN","SEEN",1);
1903 gMC->Gsatt("TOIN","COLO",7);
1904 gMC->Gsatt("TPCR","SEEN",0);
1905 gMC->Gsatt("TOCV","SEEN",1);
1906 gMC->Gsatt("TOCV","COLO",4);
1907 gMC->Gsatt("TSA1","SEEN",0);
1908 gMC->Gsatt("TSA2","SEEN",0);
1909 gMC->Gsatt("TSA3","SEEN",0);
1910 gMC->Gsatt("TSA4","SEEN",0);
1911 gMC->Gsatt("TOFC","SEEN",1);
1912 gMC->Gsatt("TOFC","COLO",4);
1913 gMC->Gsatt("TSA5","SEEN",0);
1914 gMC->Gsatt("TSA6","SEEN",0);
1915 gMC->Gsatt("TSA7","SEEN",0);
1916 gMC->Gsatt("TSA8","SEEN",0);
1917 gMC->Gsatt("TIIN","COLO",7);
1918 gMC->Gsatt("TIIN","SEEN",1);
1919 gMC->Gsatt("TICL","SEEN",0);
1920 gMC->Gsatt("TSA9","SEEN",0);
1921 gMC->Gsatt("TS10","SEEN",0);
1922 gMC->Gsatt("TS11","SEEN",0);
1923 gMC->Gsatt("TS12","SEEN",0);
1924 gMC->Gsatt("TICR","SEEN",0);
1925 gMC->Gsatt("TS13","SEEN",0);
1926 gMC->Gsatt("TS14","SEEN",0);
1927 gMC->Gsatt("TS15","SEEN",0);
1928 gMC->Gsatt("TS16","SEEN",0);
1929 gMC->Gsatt("TIFC","SEEN",1);
1930 gMC->Gsatt("TIFC","COLO",4);
1931 gMC->Gsatt("TS17","SEEN",0);
1932 gMC->Gsatt("TS18","SEEN",0);
1933 gMC->Gsatt("TS19","SEEN",0);
1934 gMC->Gsatt("TS20","SEEN",0);
1935 gMC->Gsatt("TS21","SEEN",0);
1936 gMC->Gsatt("TS22","SEEN",0);
1937 gMC->Gsatt("TS23","SEEN",0);
1938 gMC->Gsatt("TS24","SEEN",0);
1939 gMC->Gsatt("TDGN","SEEN",0);
1940 gMC->Gsatt("TIRC","SEEN",0);
1941 gMC->Gsatt("TIC1","SEEN",1);
1942 gMC->Gsatt("TIPP","SEEN",0);
1943 gMC->Gsatt("TIC3","SEEN",0);
1944 gMC->Gsatt("TRCE","SEEN",0);
1945 gMC->Gsatt("TPSC","SEEN",0);
1946 gMC->Gsatt("TPCC","SEEN",0);
1947 gMC->Gsatt("TORC","SEEN",0);
1948 gMC->Gsatt("TOPP","SEEN",0);
1949 gMC->Gsatt("TOC3","SEEN",0);
1950 gMC->Gsatt("TOC1","SEEN",1);
1951 gMC->Gsatt("TSSW","SEEN",1);
1952 gMC->Gsatt("TSWC","SEEN",1);
1953 gMC->Gsatt("TSCE","SEEN",1);
1954 gMC->Gsatt("TSSW","COLO",3);
1955 gMC->Gsatt("TSWC","COLO",3);
1956 gMC->Gsatt("TSCE","COLO",6);
1957 gMC->Gsatt("TWES","SEEN",0);
1958 gMC->Gsatt("TSWB","SEEN",0);
1959 gMC->Gsatt("TPEL","SEEN",0);
1960 gMC->Gsatt("TPMW","SEEN",1);
1961 gMC->Gsatt("TPEW","SEEN",1);
1962 gMC->Gsatt("TESR","SEEN",1);
1963 gMC->Gsatt("TPMW","COLO",12);
1964 gMC->Gsatt("TPEW","COLO",12);
1965 gMC->Gsatt("TWES","COLO",5);
1966 gMC->Gsatt("TIC1","COLO",5);
1967 gMC->Gsatt("TOC1","COLO",5);
1968 gMC->Gsatt("TESB","SEEN",0);
1969 gMC->Gsatt("TPLS","SEEN",0);
1970 gMC->Gsatt("TPUS","SEEN",0);
1971 gMC->Gsatt("TPSS","SEEN",0);
1972 gMC->Gsatt("THVM","SEEN",1);
1973 gMC->Gsatt("THVM","COLO",11);
1974 gMC->Gsatt("TPSR","SEEN",0);
1975 gMC->Gsatt("THVL","SEEN",0);
1976 gMC->Gsatt("THVC","SEEN",0);
1977 gMC->Gsatt("THVE","SEEN",0);
1978 gMC->Gsatt("THVR","SEEN",0);
1981 gMC->Gdopt("hide", "on");
1982 gMC->Gdopt("shad", "on");
1983 gMC->Gsatt("*", "fill", 7);
1984 gMC->SetClipBox(".");
1985 gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1986 gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1987 gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1988 gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1989 gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1990 gMC->DefaultRange();
1991 gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1992 gMC->Gdhead(1111, "Time Projection Chamber");
1993 gMC->Gdman(18, 4, "MAN");
1994 gMC->Gdopt("hide","off");
1997 //_____________________________________________________________________________
1998 void AliTPCv2::CreateMaterials()
2001 // Define materials for version 2 of the Time Projection Chamber
2004 AliTPC::CreateMaterials();
2007 //_____________________________________________________________________________
2008 void AliTPCv2::Init()
2011 // Initialises version 2 of the TPC after that it has been built
2014 Int_t *idtmed = fIdtmed->GetArray();
2017 fIdSens=gMC->VolId("TPSS"); // sensitive strips (not always used)
2018 fIdLSec=gMC->VolId("TPLS"); // lower sector
2019 fIdUSec=gMC->VolId("TPUS"); // upper sector
2021 gMC->SetMaxNStep(30000); // max. number of steps increased
2023 gMC->Gstpar(idtmed[2],"LOSS",5); // specific energy loss
2025 printf("*** TPC version 2 initialized ***\n");
2026 printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
2032 //_____________________________________________________________________________
2033 void AliTPCv2::StepManager()
2036 // Called for every step in the Time Projection Chamber
2040 // parameters used for the energy loss calculations
2042 const Float_t kprim = 14.35; // number of primary collisions per 1 cm
2043 const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
2044 const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
2047 const Float_t kbig = 1.e10;
2052 TClonesArray &lhits = *fHits;
2055 vol[1]=0; // preset row number to 0
2059 gMC->SetMaxStep(kbig);
2061 if(!gMC->IsTrackAlive()) return; // particle has disappeared
2063 Float_t charge = gMC->TrackCharge();
2065 if(TMath::Abs(charge)<=0.) return; // take only charged particles
2067 // check the sensitive volume
2069 id = gMC->CurrentVolID(copy); // current volume Id
2072 vol[0] = copy-1; // lower sector number
2074 else if(id == fIdUSec){
2075 vol[0] = copy+fTPCParam->GetNInnerSector()-1; // upper sector number
2077 else if(id == fIdSens && gMC->IsTrackEntering()){
2079 // track is entering the sensitive strip
2081 vol[1]= copy-1; // row number (absolute)
2085 id = gMC->CurrentVolOffID(1,copy);
2091 vol[0] = copy-1; // sector number
2098 vol[0] = copy-1+fTPCParam->GetNInnerSector(); // sector number
2099 vol[1] -= fTPCParam->GetNRowLow(); // row number
2105 // because Jouri wants to have this
2107 gMC->TrackMomentum(p);
2111 hits[3]=0.; // this hit has no energy loss
2112 new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2116 gMC->TrackPosition(p);
2120 hits[3]=0.; // this hit has no energy loss
2121 new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2127 //-----------------------------------------------------------------
2128 // charged particle is in the sensitive volume
2129 //-----------------------------------------------------------------
2131 if(gMC->TrackStep() > 0) {
2133 Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
2134 nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
2136 gMC->TrackPosition(p);
2140 hits[3]=(Float_t)nel;
2144 new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2148 // Stemax calculation for the next step
2152 gMC->TrackMomentum(mom);
2153 Float_t ptot=mom.Rho();
2154 Float_t betaGamma = ptot/gMC->TrackMass();
2156 Int_t pid=gMC->TrackPid();
2157 if((pid==kElectron || pid==kPositron) && ptot > 0.002)
2159 pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
2163 pp=kprim*BetheBloch(betaGamma);
2164 if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
2168 gMC->Rndm(random,1); // good, old GRNDM from Geant3
2170 Double_t rnd = (Double_t)random[0];
2172 gMC->SetMaxStep(-TMath::Log(rnd)/pp);
2176 //_____________________________________________________________________________
2177 Float_t AliTPCv2::BetheBloch(Float_t bg)
2180 // Bethe-Bloch energy loss formula
2182 const Double_t kp1=0.76176e-1;
2183 const Double_t kp2=10.632;
2184 const Double_t kp3=0.13279e-4;
2185 const Double_t kp4=1.8631;
2186 const Double_t kp5=1.9479;
2188 Double_t dbg = (Double_t) bg;
2190 Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
2192 Double_t aa = TMath::Power(beta,kp4);
2193 Double_t bb = TMath::Power(1./dbg,kp5);
2195 bb=TMath::Log(kp3+bb);
2197 return ((Float_t)((kp2-aa-bb)*kp1/aa));